fix: 18 bugs across interpreter, reader, emitter, and runtime

- cljMinMax now handles float and mixed int/float arguments
- cljType* covers ckSet, ckTransient, ckAgent
- cljConj and cljVec return vectors instead of lists
- rem uses truncated division semantics (matches Clojure)
- range with negative step terminates correctly
- reduce of empty collection with no init errors instead of returning nil
- swap! extra args flatten correctly
- remove duplicate not definition (dead code)
- ratio literals (1/5) parse correctly
- scientific notation uses correct variable (numTok not tok)
- readSet returns proper set value instead of (set [...]) form
- TCP REPL catches specific exceptions instead of bare except
- initBuiltinMacros guards against duplicate registration
- doseq :while clause no longer generates dead code or infinite loop
- emitter resets all global state on each emitProgram call
- pushLeaf fills gaps with internal nodes instead of nil children

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/emitter.nim

@@ -2394,6 +2394,13 @@ proc emitProgramInternal(forms: seq[CljVal]): string =
   scopeStack = @[]
   pushScope()
   requiredImports = initHashSet[string]()
+  loopStack = @[]
+  loopResultVar = ""
+  nsAliases = @[]
+  libNsPrefixes = @[]
+  definedGlobals = initHashSet[string]()
+  definedFnArities = initTable[string, int]()
+  multiArityFns = initHashSet[string]()
   var headerLines: seq[string] = @[
     "# Generated by Bara Lang",
     "import cljnim_runtime",